You could connect the subs, but I'm afraid the results would be very unsatisfactory. The second zone is essentially a completely independent signal path. It is analog only and controlled separately: the subs would not receive any signal from digital sources or the six channel analog input, you would have to switch the second zone's input every time you switched the main input, and you would need a third subwoofer connected to the 950's sub output for LFE and low frequency data transferred to the sub by the 950's bass management.

You can run two powered subs from the 950's sub output with a simple splitter, however.